A block pressed against the vertical wall is in equilibrium. The minimum coefficient of friction is:-
$0.4$
$0.2$
$0.5$
none of these
$\mu m g \leq m g-\frac{m g}{2}$
$\mu_{\min }=\frac{1}{2}$
A uniform chain of $6\, m$ length is placed on a table such that a part of its length is hanging over the edge of the table. The system is at rest. The co-efficient of static friction between the chain and the surface of the table is $0.5$, the maximum length of the chain hanging from the table is…….$m.$
A car is moving with uniform velocity on a rough horizontal road. Therefore, according to Newton's first law of motion
A heavy body of mass $25\, kg$ is to be dragged along a horizontal plane $\left( {\mu = \frac{1}{{\sqrt 3 }}} \right).$ The least force required is …….. $kgf$
Write advantages and disadvantages of friction. Write remedies to reduce friction.
Why coefficient friction is considered as static friction ?
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